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参数资料
| 型号： | SP3491EN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 FULL DUPLX 14NSOIC |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS485 |
| 电源电压： | 3.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC（窄型） |
| 包装： | 带卷 (TR) |
8
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3490_349_02_0270
Figure 9. Driver Propagation Delay Waveforms
0V
VOH
tPLH
tPHL
VOM
tPHL
tPLH
3V
VOL
VOH
1.5V
INPUT
Y OUTPUT
VOM
Z OUTPUT
VOL
VOM
VOM = VOH + VOL
2
≈ 1.5V
SWITCHING WAVEFORMS
Figure 3. Receiver Enable and Disable Waveforms
IN
1.5V
tDO1
1.5V
tDO2
3V
0V
OUT
50%
10%
90%
tTD
2.0V
-2.0V
Figure 0. Driver Differential Output Delay and
Transition Time Waveforms
0V
VOH
tPZH
0.25V
tPHZ
VOM
tPZL
tPLZ
3V
VOL
VCC
1.5V
DE
OUTPUT
HIGH
VOM
0.25V
0V
OUTPUT
LOW
VOM = VOH + VOL
2
≈ 1.5V
3V
0V
VCC
tRPLH
1.5V
tRPHL
VOM
0V
1.5V
INPUT
OUTPUT
VOM = VCC
2
Figure 2. Receiver Propagation Delay Waveforms
Figure . Driver Enable and Disable Timing
Waveforms
3V
0V
tPRHZ
1.5V
tPRZH
tPRSH
1.5V
10%
0V
VOH
REB
OUTPUT
S1 is open
S2 is closed
S3 = 1.5V
3V
0V
tPRLZ
1.5V
tPRZL
tPRSL
1.5V
10%
VCC
REB
OUTPUT
S1 is closed
S2 is open
S3 = -1.5V
VOL
NOTE : The input pulse is supplied by a generator with the following characteristics:
PRR = 250kHz, 50% duty cycle, t
R < 6.0ns, ZO = 50.
NOTE 2: C
L includes probe and stray capacitance.
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